I think you could use an ND filter. It's like sunglasses for your camera. I have an A95, which looks like the same body as your camera, and there's an adapter you can get which allows you to put filters on.
Look closely at this shot. That's my A95 with the adapter and a polarizer on it.
If you want to try rigging something up quick, you could get some cardboard, tape, and dark sunglasses, and make your own ND filter.
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